Elementary entomology ([c1912]) Elementary entomology . elementaryentomo00sand Year: [c1912] a FIG. 165. Sucking lice affecting man. (Greatly enlarged) , crab-louse (Pthirius inguinalis Leach) ; l>, head-louse characters ^Pcdiculus capitis De G.). (a, after Denny ; b, after Packard ; from Osbom, United States Department of Agriculture) eating a degenerate group. The head-louse infests the hair of man, and the body- louse, or grayback, as soldiers term it, lives in and lays its eggs in the seams of clothing. The general appearance, greatly enlarged,

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